如何使程序等待进一步的输入？

huangapple
go评论124阅读模式
英文:

How to make program wait for further input?

问题

如果你想让程序在等待其他问题的答案后再继续执行，你可以按照以下方式修改代码：

  1. package main
  3. import (
  4. 	"bufio"
  5. 	"fmt"
  6. 	"os"
  7. 	"time"
  8. )
  10. func main() {
  11. 	scanner := bufio.NewScanner(os.Stdin)
  12. 	fmt.Printf("How long did the christians walk for the crusade? :")
  13. 	scanner.Scan()
  14. 	input := scanner.Text()
  16. 	if input == "3 years" {
  17. 		fmt.Println("Correct!")
  18. 	} else {
  19. 		fmt.Println("Incorrect.")
  20. 		return // 添加 return 语句，结束程序
  21. 	}
  23. 	fmt.Printf("How many of the crusades were won by christians? :")
  24. 	scanner.Scan()
  25. 	input = scanner.Text()
  27. 	if input == "1" {
  28. 		fmt.Println("Correct!")
  29. 	} else {
  30. 		fmt.Println("Incorrect.")
  31. 		return // 添加 return 语句，结束程序
  32. 	}
  34. 	fmt.Printf("Who started the crusades? :")
  35. 	scanner.Scan()
  36. 	input = scanner.Text()
  38. 	if input == "the pope" {
  39. 		fmt.Println("Correct!")
  40. 	} else {
  41. 		fmt.Println("Incorrect.")
  42. 		return // 添加 return 语句，结束程序
  43. 	}
  45. 	fmt.Printf("Thank you for playing!")
  46. 	time.Sleep(2 * time.Hour)
  47. }

通过在每个问题后添加 return 语句，如果答案不正确，程序将会提前结束。这样就可以等待用户输入每个问题的答案后再继续执行。

英文:

If I run the below program and enter an answer (e.g. "3 years") the program completes without waiting for any further input e.g.:

  1. How long did the christians walk for the crusade? :3 years
  2. Correct!
  3. How many of the crusades were won by christians? :Incorrect.
  4. Who started the crusades? :Incorrect.
  5. Thank you for playing!

How can I make it wait for answers to the other questions?

  1. package main
  3. import (
  4. 	"bufio"
  5. 	"fmt"
  6. 	"os"
  7. 	"time"
  8. )
  10. func main() {
  11. 	scanner := bufio.NewScanner(os.Stdin)
  12. 	fmt.Printf("How long did the christians walk for the crusade? :")
  13. 	scanner.Scan()
  14. 	input := scanner.Text()
  16. 	if input == "3 years" {
  17. 		fmt.Println("Correct!")
  18. 	} else {
  19. 		fmt.Println("Incorrect.")
  20. 	}
  22. 	fmt.Printf("How many of the crusades were won by christians? :")
  24. 	if input == "1" {
  25. 		fmt.Println("Correct!")
  26. 	} else {
  27. 		fmt.Println("Incorrect.")
  28. 	}
  30. 	fmt.Printf("Who started the crusades? :")
  32. 	if input == "the pope" {
  33. 		fmt.Println("Correct!")
  34. 	} else {
  35. 		fmt.Println("Incorrect.")
  36. 	}
  38. 	fmt.Printf("Thank you for playing!")
  39. 	time.Sleep(2 * time.Hour)
  40. }

答案1

得分: 1

以上代码将接受一行输入，并将结果存储在变量input中。

所以当你的程序运行时，它会问第一个问题并等待答案；假设我回答“1天”，那么input == "1天"。在此之后，input的值不会改变-你正在将用户输入的第一个值与多个答案进行比较，即"1天" == "3年"和"1天" == "教皇"。

如果你想接受额外的行，你需要重复调用scanner.Scan()，例如：

  1. scanner.Scan()
  2. input := scanner.Text()
  4. if input == "3年" {
  5.     fmt.Println("正确！")
  6. } else {
  7.     fmt.Println("错误。")
  8. }
  10. fmt.Printf("十字军中有多少次是基督徒赢得了胜利？：")
  11. scanner.Scan() // 从scanner获取下一个答案
  12. input = scanner.Text()
  14. if input == "1" {
  15.     fmt.Println("正确！")
  16. } else {
  17.     fmt.Println("错误。")
  18. }

请注意，你可以通过使用一个函数来简化这个过程：

  1. package main
  3. import (
  4.     "bufio"
  5.     "fmt"
  6.     "os"
  7. )
  9. func main() {
  10.     s := bufio.NewScanner(os.Stdin)
  12.     askQuestion(s, "基督徒为了十字军而行走了多久？：", "3年")
  13.     askQuestion(s, "十字军中有多少次是基督徒赢得了胜利？：", "1")
  14.     askQuestion(s, "谁发起了十字军？：", "教皇")
  16.     fmt.Printf("谢谢参与！")
  17. }
  19. func askQuestion(s *bufio.Scanner, question string, answer string) {
  20.     fmt.Print(question)
  21.     if !s.Scan() {
  22.         panic(fmt.Sprintf("扫描失败：%s", s.Err()))
  23.     }
  24.     if s.Text() == answer {
  25.         fmt.Println("正确！")
  26.     } else {
  27.         fmt.Println("错误。")
  28.     }
  29. }
英文: 
  1. scanner.Scan()
  2. input := scanner.Text()

The above will accept a single line of input and store the result in the variable input.

So when your program runs it asks the first question and waits for an answer; lets say I answer with "1 day" then input == "1 day". The value of Input is not changed after that point - you are comparing the first value the user enters against multiple answers i.e. "1 day" == "3 years" and "1 day" == "the pope".

If you want to accept additional lines you will need to repeat the call e.g.

  1. scanner.Scan()
  2. input := scanner.Text()
  4. if input == "3 years" {
  5. 	fmt.Println("Correct!")
  6. } else {
  7. 	fmt.Println("Incorrect.")
  8. }
  10. fmt.Printf("How many of the crusades were won by christians? :")
  11. scanner.Scan() // Get next answer from scanner
  12. input = scanner.Text()
  14. if input == "1" {
  15. 	fmt.Println("Correct!")
  16. } else {
  17. 	fmt.Println("Incorrect.")
  18. }

Note that you can simplify this considerably by using a function:

  1. package main
  3. import (
  4. 	"bufio"
  5. 	"fmt"
  6. 	"os"
  7. )
  9. func main() {
  10. 	s := bufio.NewScanner(os.Stdin)
  12. 	askQuestion(s, "How long did the christians walk for the crusade? :", "3 years")
  13. 	askQuestion(s, "How many of the crusades were won by christians? :", "1")
  14. 	askQuestion(s, "Who started the crusades? :", "the pope")
  16. 	fmt.Printf("Thank you for playing!")
  17. }
  19. func askQuestion(s *bufio.Scanner, question string, answer string) {
  20. 	fmt.Print(question)
  21. 	if !s.Scan() {
  22. 		panic(fmt.Sprintf("scan failed: %s", s.Err()))
  23. 	}
  24. 	if s.Text() == answer {
  25. 		fmt.Println("Correct!")
  26. 	} else {
  27. 		fmt.Println("Incorrect.")
  28. 	}
  29. }

huangapple
  • 本文由 发表于 2022年2月13日 09:20:58
  • 转载请务必保留本文链接：https://go.coder-hub.com/71097185.html
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